Igniting apparatus for sintering pans



March 13, 1928.

HOLMBERG IGNITING APPARATUS FOR SINTERING PANS Filed Nov. 23. 1925 2 sheetg -sheet 1 March 13, 1928. 1,662,513

A. HOLMBERG IGNITING APPARATUS FOR SINTERING FANS Filed Nov. 23. 1925 2 Shets-Sheet 2 Patented Mar. 13, 1928.

UNITED STATES PATENTIQFFICIE.

ANDERS HOLMBERG, or srooKHoLM, SWEDEN, AssIGnoR TO HELGEGUSTAF TORULF, or STOCKHOLM, SWEDEN.

IGNITING APPARATUS FOR SINTERING PANS.

Application filed November 23, 1925, Serial No. 71,004, and in Sweden December 1, 1924.

This invention relates to an improved igniting apparatus for circular sinteriug pans in which the charge is ignited at the upper surface by means of a liquid or gas eous fuel and the combustion of the fuel contained in the charge is effected by a down draft.

The chief object of the invention is toprovide means for effecting a uniform and speedy ignition of the charge over the whole upper surface.

YVith this and other objects in view the invention consists, chiefly, in an igniting apparatus, comprising a ring-shaped frame adapted to be placed above the pan to be ignited, a plurality of burners rotatably journalled in said frame, and an operating ring connected to all burners and adapted to rotate said burners simultaneously to and fro so as to cause the flames from the burners to sweep a large portion of the surface of the charge.

In the accompanying drawings I have shown one embodiment of my invention.

' Fig. 1 shows a partly sectional elevation of the igniting apparatus and Fig. 2 is a plan thereof.

Referring now to the drawings, the igniting apparatus is supported by a travelling bracket crane l movable along a row of work places, thus enabling an easy transport of the igniting apparatus from one work place to another. The bracket 2 of the crane is rotatably journalled about a horizontal pin 8 and is counterbalanced by weights 4 supported by wires 5 carried over rollers 6 and secured to the outer end of the bracket. The bracket carries a cross 7 of angle iron to which a ring 9 of about the same diameter as that of the pan 10 to be ignited is secured by means of downward extending arms 8. The ring 9 which is wholly open at the top is supported by means of a flange 11 on the top flange 12 of the pan. To the flange 11 brackets 13 are secured in which holders 14: for the burners 15 are journalled by The burners have each an brackets 19 radially extendingfrom thering 9, so that all burners can be rotated simultaneously by turning said ring. An opening 20 is provided in the'ring 9 for each burner, said openingsbeing of such sizethat they permit the horizontal and vertical'adjustments of the burners.

The bracket crane carries further a tank 21 for oil or other liquid fuel under pres sure and an air pump 22 for creating the necessary pressure in said tank. From the oil tank 21 a tube or other flexible piping 23 having a shutoff valve 24 extends to the igniting apparatus where it is branched off to the several burners. Provided on the bracket crane is further a tube or piping 25 adapted to be connectedto a stationary pipe 26 for pressure air, the latter being for such purpose provided with branch pipes 27 with admission valves 28 at suitable intervals. The piping 25 is likewise branched off to the several burners.

The operation of the apparatus above described is as follows. The igniting apparatus is placed above the sintering pan to be ignited as is shown in the drawings whereupon fuel and pressure air are admitted to the burners by opening the valves 24 and 28. The fuel'becomes finely divided by the high pressure and leaves the burners intimately mixed with the escaping air so that it is easily ignited. As soonas the burners have become hot at more or less complete vaporization of the fuel takes place when the fuel flows through the burners. By

adjusting the pressure of the fuel and the air the length and intensity of the flames can be regulated at will. By turning the adjusting ring 18 the burners 15 can be rotated horizontally, thus causing the flames to sweep the whole surface of the charge. The arrows 29, Fig. 2, indicate the directions of the flames in the one outermost position of the burners. When theaXes of the burners have an oblique position in relation to radii from the centre of the supporting ring the flames impart a whirling motion to the air above the charge whereby the flames are themselves to some extent rotated and their spreading over the surface of the charge is facilitated. The ignition carried outwith the apparatus above described can be easily supervised and regulated as desired, inasmuch as all operating parts are easily ac cessible and the flames can be supervised from outside as the supporting ringiis entirely open at the top and only serves to limit the spreading of the flames horizontally to a surface corresponding to the free upper surface of the charge.

vVhen the ignition is finished the valves 24 and 28 are closed and the tube 25 is disconnected whereupon the igniting apparatus is raisediand the crane together with said apparatus is moved to the next pan to he ignited.

For the h acket crane provided for transporting the igniting apparatus I may suhstitute a carriage movable on a track along the side of the pans or above them and sup porting the said apparatus.

What I claim is:-

An apparatus for igniting the. charge of circular sintering pans for line ores and the like. comprising a ring-shaped frame adapted to he placed above the pan to he ignited, a plurality of burners rotatably journalled in said frame, and an opelatinp ring connected to the burners and adapted to rotate the latter simultaneously to and fro so as to cause the flames from the burners to sweep a large portion of the surface of the charge.

In testimon whereof I have signed my name.

ANDERS HOLMBERG. 

